fixed a log message

Author: zashraf1985

lib/optimizely/decision_service.rb

@@ -425,7 +425,7 @@ def get_saved_variation_id(project_config, experiment_id, user_profile)
       variation_id = decision[:variation_id]
       return variation_id, nil if project_config.variation_id_exists?(experiment_id, variation_id)
 
-      message = "User '#{user_profile['user_id']}' was previously bucketed into variation ID '#{variation_id}' for experiment '#{experiment_id}', but no matching variation was found. Re-bucketing user."
+      message = "User '#{user_profile[:user_id]}' was previously bucketed into variation ID '#{variation_id}' for experiment '#{experiment_id}', but no matching variation was found. Re-bucketing user."
       @logger.log(Logger::INFO, message)
 
       [nil, message]

spec/decision_service_spec.rb

@@ -380,7 +380,7 @@
         variation_received, reasons = decision_service.get_variation(config, 'test_experiment', 'test_user')
         expect(variation_received).to eq('111128')
         expect(reasons).to eq([
-                                "User '' was previously bucketed into variation ID '111111' for experiment '111127', but no matching variation was found. Re-bucketing user.",
+                                "User 'test_user' was previously bucketed into variation ID '111111' for experiment '111127', but no matching variation was found. Re-bucketing user.",
                                 "Audiences for experiment 'test_experiment' collectively evaluated to TRUE.",
                                 "User 'test_user' is in variation 'control' of experiment 'test_experiment'."
                               ])